Mechanical behavior of additive manufactured, powder-bed laser-fused materials

Mower, Todd M.; Long, Michael J.

doi:10.1016/j.msea.2015.10.068

Cited by 821 publications

(425 citation statements)

References 27 publications

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“…Investigations of the microstructure and monotonic properties of the AM-materials are available in a large quantity. Microstructural investigations of Mower et al [13], Yasa et al [14], and Casati et al [15] on selective laser melted austenitic stainless steel AISI 316L showed an elongation of grains along the building direction and visibility of the layer boundaries in light optical micrographs (LOMs), which is in accordance to the investigations of Brandl et al [16] on laser deposition welded Ti6Al4V, Caiazzo et al on laser powder bed fused Inconel 718 [17], and Bauer et al [18] on the selective laser melted nickel based superalloy Haynes230 ® . Mower et al [13] also observed this typical microstructure in AlSi10Mg.…”

Section: Introductionmentioning

confidence: 98%

An Investigation of the Microstructure and Fatigue Behavior of Additively Manufactured AISI 316L Stainless Steel with Regard to the Influence of Heat Treatment

Blinn

Klein

Gläßner

et al. 2018

Metals

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Abstract:To exploit the whole potential of Additive Manufacturing, it is essential to investigate the complex relationships between Additive Manufacturing processes, the resulting microstructure, and mechanical properties of the materials and components. In the present work, Selective Laser Melted (SLM) (process category: powder bed fusion), Laser Deposition Welded (LDW) (process category: direct energy deposition) and, for comparison, Continuous Casted and then hot and cold drawn (CC) austenitic stainless steel AISI 316L blanks were investigated with regard to their microstructure and mechanical properties. To exclude the influence of surface topography and focus the investigation on the volume microstructure, the blanks were turned into final geometry of specimens. The additively manufactured (AM-) blanks were manufactured in both the horizontal and vertical building directions. In the horizontally built specimens, the layer planes are perpendicular and in vertical building direction, they are parallel to the load axis of the specimens. The materials from different manufacturing processes exhibit different chemical composition and hence, austenite stability. Additionally, all types of blanks were heat treated (2 h, 1070 • C, H 2 O) and the influence of the heat treatment on the properties of differently manufactured materials were investigated. From the cyclic deformation curves obtained in the load increase tests, the anisotropic fatigue behavior of the AM-specimens could be detected with only one specimen in each building direction for the different Additive Manufacturing processes, which could be confirmed by constant amplitude tests. The results showed higher fatigue strength for horizontally built specimens compared to the vertical building direction. Furthermore, the constant amplitude tests show that the austenite stability influences the fatigue behavior of differently manufactured 316L. Using load increase tests as an efficient rating method of the anisotropic fatigue behavior, the influence of the heat treatment on anisotropy could be determined with a small number of specimens. These investigations showed no significant influence of the heat treatment on the anisotropic behavior of the AM-specimens.

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Section: Introductionmentioning

confidence: 98%

An Investigation of the Microstructure and Fatigue Behavior of Additively Manufactured AISI 316L Stainless Steel with Regard to the Influence of Heat Treatment

Blinn

Klein

Gläßner

et al. 2018

Metals

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“…The latter implies that the build orientation may not influence the fatigue life if the specimens are solution treated. [4,[6][7][8]. 'Rough' and 'Machined' refer to the surface condition, and 'as-built' and 'T6' refer to the heat treatment condition.…”

Section: Introductionmentioning

confidence: 99%

“…Mower et al [8] investigated the bending fatigue life (R = -1) of as-built and polished surfaces. In their work, the "as-built" surface finish was from specimens that were oriented at 0° and 90°, while the "polished" surface finish was from specimens that were oriented only at 0°.…”

Section: Introductionmentioning

confidence: 99%

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High cycle fatigue life estimation of AlSi10Mg processed by laser powder bed fusion

et al. 2018

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Abstract.Fatigue life is known to be dependent on the surface properties of the material. Surface roughness provokes local stress concentration and cause crack initiation even at minute cyclic loads. In laser powder bed fusion, the as-built surfaces show variable roughness depending on the orientation of the specimens with respect to the build plate. In order to analyse the effect of build angle on surface properties, flat tensile specimens were produced from an AlSi10Mg alloy in a Concept Laser M2 Cusing machine. Seven specimens were arranged from flat to perpendicular with respect to the build plate at 15° intervals. The as-built surface topography of each specimen was characterised by white light interferometry. Two methods for calculating the stress concentration factor for high cycle fatigue simulation were developed. The presence of subsurface porosity was a crucial factor in expanding the stress concentration as demonstrated by finite element analysis.

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“…New types of materials were successfully developed in the last years in this field, being machinable on the SLM modern equipment [1][2][3]. The mechanical behaviour of the airplane components produced from different type of materials was one of the most important researches developed in this field by different researchers in the world [4][5]. Shape optimization and FEA programs are often used in order to estimate the mechanical behaviour of different type of airplane components made by SLM technology [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Research on the mechanical behaviour of an airplane component made by selective laser melting technology

Păcurar

Bâlc

2017

MATEC Web Conf.

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Abstract. The main objective of the presented research consists in the redesign of an airplane component to decrease its weight, without affecting the mechanical behaviour of the component, at the end. Femap NX Nastran and ANSYS FEA programs were used for the shape optimization and for the estimation of the mechanical behaviour of a fixing clamp that was used to sustain the hydraulic pipes that are passing through an airplane fuselage, taking into consideration two types of raw materials -Ti6Al4V and AlSi12 powder from which this component could be manufactured by using the selective laser melting (SLM) technology. Based on the obtained results, the airplane component was finally manufactured from titanium alloy using the SLM 250 HL equipment that is available at SLM Solutions GmbH company from Luebeck, in Germany.

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Mechanical behavior of additive manufactured, powder-bed laser-fused materials

Cited by 821 publications

References 27 publications

An Investigation of the Microstructure and Fatigue Behavior of Additively Manufactured AISI 316L Stainless Steel with Regard to the Influence of Heat Treatment

An Investigation of the Microstructure and Fatigue Behavior of Additively Manufactured AISI 316L Stainless Steel with Regard to the Influence of Heat Treatment

High cycle fatigue life estimation of AlSi10Mg processed by laser powder bed fusion

Research on the mechanical behaviour of an airplane component made by selective laser melting technology

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